Salam,  It was not difficult for Umar bin Khattab to realize what was said by Prophet (صلى الله عليه وآله وسلم), so he greeted Imam Ali (عليه السلام) for becoming his mowla & mowla of all believers.  It is not our concern what scholars of Ahlul Sunnah believes. Obviously when close companions like Abu Bakr & Umar, who pledged allegiance at Ghadir and have congratulated Imam Ali (عليه السلام), turned on their backs after the demise of Prophet (صلى الله عليه وآله وسلم), the sch